Chelsea have a Champions League conundrum lurking in wait for their next manager.
The London club, who want Frank Lampard to replace Maurizio Sarri, will return to Europe's top competition next season but a transfer ban imposed by FIFA means they cannot make any new signings.
And while there will be plenty of talent returning to Chelsea from various loan spells this summer, many of these players will not meet the UEFA criteria for 'home-grown' players.
Callum Hudson-Odoi is one of Chelsea's few 'club-trained' stars but is sidelined with injury
This will leave Sarri's successor to work with fewer than 25 senior players in the Champions League where restrictions are tighter than in the Premier League.
Eight of the 25-man squad for UEFA competitions must classify as 'home-grown' and four of those eight must be 'club-trained'.
Tottenham manager Mauricio Pochettino grumbled about the rules last season when he came to regret omitting Juan Foyth from the group stages to meet the quotas.
The restrictions will become even more pertinent next season when teams will be allowed to name 12 substitutes on the bench for European competitions.
Chelsea will have to balance the benefits of sending some young players on loan to develop with the need to fill their bench in the Champions League.
Christian Pulisic, signed in January from Borussia Dortmund, will classify as an Under-21 player
Andreas Christensen and Ruben Loftus-Cheek qualify as 'club-trained' players, although Loftus-Cheek is facing months out with a ruptured achilles tendon.
Tammy Abraham and Fikayo Tomori would also count and Ross Barkley is 'home-grown' but not 'club-trained'.
Gary Cahill and Cesc Fabregas, two senior players who helped fulfil the quota, have left Chelsea this year.
Victor Moses, who is a 'home-grown' player, is six months into an 18-month loan
